Process of spinning, drawing, and doubling yarn



- H. MALY- PROCESS OF srmume, DRAWING, AND DOUBLING YARN m W e e &

. n 6 xanfiz j Oct. 5 1926.

MALY PROCESS OF SPINNING, DRAWING, AND nouanme'unn Filed 'July' 29, 1925I j /l/I/I/l/I///////////////////////I/IlI/W/fi! Patented Oct. 5, 1926.Y

HERMANN MALY, OF GUBEN, GERMANY.

PROCESS OF SPINNING,-DRAWING, AND DOUIBLING YARN.

Application filed July 29, 1925, Serial No. 46,916,

A usual practice in spinning yarn is to draw the rovings in a.two-roller mule, and impart greater attenuation in a three-roller mule.

The object of my invention is to improve the uniformity, strength andfineness of the yarn and to insure that the twist is mainly at thecircumferential part thereof; also to prevent back-twist, and securegreater tensile strength and stretchability.

In dealing with unspun rovings I attain these objects by disposingbetween the delivery rollers and the spindle, nearer to, the former thanto the latter, a brake or resistance over which the fibre travels.Between this brake and the spindle the yarn is fully spun, and thislonger portion of the yarn draws fibre from the loose bunch behind thebrake, somewhat as occurred with the old distafi' and spindle. The brakeeffect is preferably made regulatable, so that the transmission of twistfrom the spun yarn to the loose fibre behind the brake can be regulatedas required. v

For doubling, the single yarns travel separately to the brake. The twistgiven for doubling is in the opposite direction to the twist of thefibres, so that there is some untwisting of the yarn, which allows ofstretching.

The invention is illustrated in the annexed drawings, which show variousexamples, Figs. 1 to 3 relating to spinning, and Figs. 4 to 7 todoubling.

As shown in Fig. 1 the delivery rollers a, a deliver loosely spun yarnb, which at 0 passes over a brake d, and thence to the spindle 6. Owingto the provision of the brake, by'far the greater part of the twistimparted by the spindle is confined to that part ofthe yarn which isbetween the spindle and the brake. Between the spindle and brake thereis little or no stretch, and the spun yarn draws out fibre in proportionas the speed of the carriage exceeds the rate of delivery of therollers.

The brake may be made vertically adjustable, for regulating its effect,or a larger or smaller brake may be substituted for the same purpose;these two regulating methods may be used in conjunction. Fig. 1 shows aflat-topped brake across which the fibre runs from c to 0 I may alsoregulate the brake effect by vertically adjusting the rollers, leavingthe brake stationary.

and in Germany August 1, 1924.

For spinning and drawing yarn already partly spun the process is similarto. that used for spinning from rovings, but thespindle e is rotated inthe opposite direction to the twist of the partly spun yarn, with suchexcess of speed that the .part b leaving the rollers is untwisted.

For drawing and spinning with a threeroller mule, is substantially thesame, but-about half the drawing is preferably left to -",drawingrollers, the remaining half being effected by the combined spinning anddrawing operation described. I

With the apparatus shown in Fig. 5 for doubling, the brake cl isfs oregulated, according to the yarn dealt;. =with, that the untwistingeffect due to rotatingthe spindle in the opposite direction to the twistof the yarn does not proceed beyond the point 0,

or only doesso to a p i;determined, limited extent. The region of-moreor less loose fibre is in this-case between 0 and 0 The yarns between 0and I) retain their original twist, and are not drawn. The yarn isdoubled at 0 or close to this point. There may be more than two yarns.By this method thread of goodor fair strength may be obtained bydoubling yarns where the doubling and the twist of the yarns are in thesame direction, or where the doubled yarns are of opposite twist, thoughwith other methods such yarns are not at all strong.

The doubled yarn is in fact of a novel kind. The doubling is permanentand independent of the direction of twist by which it is done, and ofthe twist of the separate yarns. Irregularities of thickness of theseparate yarns, such as shown at h in Fig. 4, are entirely eliminated inthe doubled yarn, whereas with other methods they cause inequalitiessuch as shown at g in Fig. 4.

Apart from the more thorough preparation of the rovings for thethree-roller system, as compared withthe two roller system, the spinningoperations whereby the yarns are formed are different with these twosystems, as heretofore practised, but with my method yarns produced bythe tworoller and three-roller systems are technically yarns of the samekind. (lifi'erent'only as regards the degree to which the fibres wereprepared for spinning.

The distance between the rollers and as shown in Fig. 3, the methodbrakeis made longer or shorter, according to the length of the fibres.

I have described he process with reference to mules, where'the carriagewith the spindles is reciprocated, but I may employ it with system inwhich the spindles are stav tionary and the yarn feeders are on acarriage. c WVhat I claimis:

1. The methodof spinning textile fibers, consisting in subjecting thefibers to a restraining influence adjacent the drawing rollersintermediate the latter and a mule spindle whereby the twist due to therotation of the spindle is imposed preponderantly on the length of fiberintermediate the point of application of said restraining influence andthe spindle, the length of spun yarn drawing fiber from behind the pointof application of said restraining influence.

2. The method of spinning textile fibers, consisting in subjecting thefibers to a re- 1 straining influence adjacent the drawing rollersintermediate the latter and a mule mission of twist from the spun yarnand the fiber behind the point of application of said restraininginfluence.

3. The method of doubling yarn fibers,

consisting in subjecting the yarn to a restraining influence adjacentthe drawing or delivery rollers intermediate the latter and a mulespindle, and rotating the spindle in the opposite direction to the twistof the yarn fibers whereby the separate yarns are untwi'sted between therollers and the point of application of the restraininginfluence.

4c. The method of doubling yarn fibers, consisting in subjecting theyarn to a restraining influence adjaccnt the drawing or delivery rollersintermediate the latter and a mule spindle, and rotating the spindle inthe oppositevdirection to the twist of the yarn fibers whereby theseparate yarns are untwisted between the rollers and the point ofapplication of the restraining influence, and adjusting the resistanceof said restraining influence for controlling the longitudinal extent ofthe untwisting action.

The method of doubling yarn fibers,

consisting in passing the separate yarns singly through drawing ordelivery rollers, sub ecting the fibers to a restraining 1nfiuencesubsequent to the1r passage through the rollers, and' 'winding the yarnon a spindle rotating in the opposite direction to the twist of thefibers, whereby the separate yarns are untwisted between the rollers andthe point of application of the restraining influence and unitedsubstantially at said point.

In testimony whereof the foregoing specification is signed.

HERMANN MALY.

